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-Structure paper
Title | Growth phase-dependent reorganization of cryptophyte photosystem I antennae. |
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Journal, issue, pages | Commun Biol, Vol. 7, Issue 1, Page 560, Year 2024 |
Publish date | May 11, 2024 |
Authors | Shumeng Zhang / Long Si / Xiaodong Su / Xuelin Zhao / Xiaomin An / Mei Li / |
PubMed Abstract | Photosynthetic cryptophytes are eukaryotic algae that utilize membrane-embedded chlorophyll a/c binding proteins (CACs) and lumen-localized phycobiliproteins (PBPs) as their light-harvesting antennae. ...Photosynthetic cryptophytes are eukaryotic algae that utilize membrane-embedded chlorophyll a/c binding proteins (CACs) and lumen-localized phycobiliproteins (PBPs) as their light-harvesting antennae. Cryptophytes go through logarithmic and stationary growth phases, and may adjust their light-harvesting capability according to their particular growth state. How cryptophytes change the type/arrangement of the photosynthetic antenna proteins to regulate their light-harvesting remains unknown. Here we solve four structures of cryptophyte photosystem I (PSI) bound with CACs that show the rearrangement of CACs at different growth phases. We identify a cryptophyte-unique protein, PsaQ, which harbors two chlorophyll molecules. PsaQ specifically binds to the lumenal region of PSI during logarithmic growth phase and may assist the association of PBPs with photosystems and energy transfer from PBPs to photosystems. |
External links | Commun Biol / PubMed:38734819 / PubMed Central |
Methods | EM (single particle) |
Resolution | 2.7 - 3.5 Å |
Structure data | EMDB-37642, PDB-8wm6: EMDB-37654, PDB-8wmj: EMDB-37659, PDB-8wmv: EMDB-37660, PDB-8wmw: EMDB-37674, PDB-8wnw: |
Chemicals | ChemComp-CLA: ChemComp-PQN: ChemComp-LHG:
ChemComp-WVN: ChemComp-LMT: ChemComp-SF4: ChemComp-DGD: ChemComp-LMG: ChemComp-II0: ChemComp-IHT: ChemComp-KC2: ChemComp-LMU: ChemComp-HOH: |
Source |
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Keywords | PHOTOSYNTHESIS / thylakoid membrane / chlorophyll plastid / oxyphototroph / alloxanthin / chlorophyll c / PsaQ / growth phase / chlorophyll |